The localities discussed in this paper are situated in the southwestern part of Alaska, on the shores of Cook inlet and on the Alaska peninsula. Most of them are on the strip of coast forming the southern half of the shore of Cook inlet and the eastern half of the south shore of the Alaska peninsula.
The facts here presented include some of the results of a trip made by the authors in small boats during the summer of 1904 from Snug harbor, on Cook inlet, to Cold bay, on Shelikof strait. Isolated localities both to the eastward and to the westward were also visited.
There are various references to the Mesozoic rocks and fossils of parts of this region. Many of the early references† have been summarized by Dall,* who made some valuable original observations on the stratigraphy and paleontology at Tuxedni harbor (Snug harbor), Cold bay, . . .